Abstract
The České středohoří Mts. is the dominant volcanic center of the Ohře (Eger) rift zone. It hosts the Roztoky Intrusive Complex (RIC), which is made up of a caldera vent and intrusions of 33–28-Ma-old hypabyssal bodies of essexite–monzodiorite–sodalite syenite series accompanied by a radially oriented 30–25-Ma-old dike swarm comprising about 1,000 dikes. The hypabyssal rocks are mildly alkaline mostly foid-bearing types of mafic to intermediate compositions. The dike swarm consists of chemically mildly alkaline and rare strongly alkaline rocks (tinguaites). The geochemical signatures of the mildly alkaline hypabyssal and associated dike rocks of the RIC are consistent with HIMU mantle sources and contributions from lithospheric mantle. The compositional variations of essexite and monzodiorite can be best explained by fractional crystallization of parent magma without significant contributions of crustal material. On the other hand, the composition of monzosyenite, leuco-monzodiorite and sodalite syenite reflects fractional crystallization coupled with variable degrees of crustal assimilation. It is suggested that the parent magmas in the Ohře rift were produced by an adiabatic decompression melting of ambient upper mantle in response to lithospheric extension associated with the Alpine Orogeny.
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Acknowledgments
This research was supported by the Grant Agency of the Academy of Sciences of the Czech Republic project IAA300130902 and falls within the Research Programme of the Institute of Geology, v. v. i., RVO67985831. Financial support of Ministry of Education (project MSM 0021620855 of the Charles University) is greatly acknowledged. We are indebted to P. Špaček, Institute of Geophysics AS CR, v. v. i. for many useful discussion of the deep structure of the Bohemian Massif, L. Strnad (Faculty of Science, Charles University in Prague) and V. Böhmová Institute of Geology AS CR, v. v. i., Prague) who carried out chemical analyses, and J. Pavková and J. Rajlichová (Institute of Geology AS CR, v. v. i., Prague) for technical assistance. The paper benefited from detailed reviews by Michele Lustrino and John Greenough.
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Skála, R., Ulrych, J., Ackerman, L. et al. Tertiary alkaline Roztoky Intrusive Complex, České středohoří Mts., Czech Republic: petrogenetic characteristics. Int J Earth Sci (Geol Rundsch) 103, 1233–1262 (2014). https://doi.org/10.1007/s00531-013-0948-7
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DOI: https://doi.org/10.1007/s00531-013-0948-7